1. (只要看一眼這封信) ____________ , will convince you that you have been taken in.
2. Please don’t stand in the kitchen, you’re________________ (擋路了) .
3. ________ (如果暴露在空氣中) , iron will react with the oxygen of the air.
4. ________ (對聽到的事情感到震驚) , he placed both his hands on his mouth.
5. We’d better struggle for the future ________ (而不是為過去而懊悔) .